The return of steam trains?

The things you learn thanks to one's Google feed. A Google feed that knows me sometimes a bit too much. Anyway, so I read this article about the possible return of steam trains. Not the steam trains of yesteryear though, something that will be powered by a new technology. I guess it means they will not have the charm of old steam engines, although you never know. I am not an engineer, so I cannot say that I understand the details all that much, but all the same. It would be cool if true. On a side note, this is one of things I love about trains: they evolve yet keep a certain timeless charm.